#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>


#define BUF_SIZE 1024
void error_handling( char *msg);

int main(int argc, char *argv[])
{   
    int sock;
    char msg[BUF_SIZE];
    int str_len;
    struct sockaddr_in serv_adr;

    if ( argc != 3) {
        printf("Usage: %s <IP> <port>\n", argv[0]);
        exit(1);
    }

    sock = socket(PF_INET, SOCK_STREAM, 0);
    if (-1 == sock) {
        error_handling("socket() error");
    }

    memset(&serv_adr, 0, sizeof(serv_adr));
    serv_adr.sin_family = AF_INET;
    serv_adr.sin_addr.s_addr = inet_addr(argv[1]);
    serv_adr.sin_port   = htons(atoi(argv[2]));

    if ( -1 == connect(sock, 
        (struct sockaddr *)&serv_adr, sizeof(serv_adr))) {
        error_handling("connect() error!");
    }
    else {
        puts("Connected.......");
    }

    while (1) {
        fputs("Input message(Q to quit): ", stdout);
        fgets(msg, BUF_SIZE, stdin);

        if (!strcmp(msg, "q\n") || !strcmp(msg, "Q\n'"))
            break;
        write(sock, msg, strlen(msg));
        str_len = read(sock, msg, BUF_SIZE - 1);
        msg[str_len] = 0;
        printf("Message from server: %s", msg);
    }
    close(sock);


    return 0;
}

void error_handling(char *msg)
{
    fputs(msg, stderr);
    fputc('\n', stderr);
    exit(1);
}